import sequtils, strutils


# std should include the procedure.
proc initSet[T: Ordinal](s: openArray[T]): set[T] =
  for x in s:
    result.incl(x)

proc isPangram*(input: string): bool = 
  var letters = initSet(input.toLower.filter(isAlphaAscii))
  letters == {'a' .. 'z'}